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The Single UNIX &reg; Specification, Version 2<br>
Copyright &copy; 1997 The Open Group

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<h4>NAME</h4><blockquote>
endservent, getservbyport, getservbyname, getservent, setservent - network services database functions
</blockquote><h4>SYNOPSIS</h4><blockquote>
<pre><code>

#include &lt;<a href="netdb.h.html">netdb.h</a>&gt;

void endservent(void);

struct servent *getservbyname(const char *<I>name</I>, const char *<I>proto</I>);

struct servent *getservbyport(int <I>port</I>, const char *<I>proto</I>);

struct servent *getservent(void);

void setservent(int <I>stayopen</I>);
</code>
</pre>
</blockquote><h4>DESCRIPTION</h4><blockquote>
The
<i>getservbyname()</i>,
<i><a href="getservbyport.html">getservbyport()</a></i>
and
<i>getservent()</i>
functions each return a pointer to a <B>servent</B> structure, the members of
which contain the fields of an entry in the network services database.
<p>
The
<i>getservent()</i>
function reads the next entry of the database, opening a connection to the
database if necessary.
<p>
The
<i>getservbyname()</i>
function searches the database from the beginning and finds the first entry
for which the service name specified by <I>name</I> matches the <B>s_name</B>
member and the protocol name specified by <I>proto</I> matches the
<B>s_proto</B> member, opening a connection to the database if necessary.  If
<I>proto</I> is a null pointer, any value of the <B>s_proto</B> member will be
matched.
<p>
The
<i><a href="getservbyport.html">getservbyport()</a></i>
function searches the database from the beginning and finds the first entry
for which the port specified by <I>port</I> matches the <B>s_port</B> member and
the protocol name specified by <I>proto</I> matches the <B>s_proto</B> member,
opening a connection to the database if necessary.  If <I>proto</I> is a null
pointer, any value of the <B>s_proto</B> member will be matched.  The
<I>port</I> argument must be in network byte order.
<p>
The
<i><a href="setservent.html">setservent()</a></i>
function opens a connection to the database, and sets the next entry to the
first entry.  If the <I>stayopen</I> argument is non-zero, the net database
will not be closed after each call to the
<i>getservent()</i>
function (either directly, or indirectly through one of the other
<i>getserv*()</i>
functions).
<p>
The
<i>endservent()</i>
function closes the database.
</blockquote><h4>RETURN VALUES</h4><blockquote>
On successful completion,
<i>getservbyname()</i>,
<i><a href="getservbyport.html">getservbyport()</a></i>
and
<i>getservent()</i>
return a pointer to a <B>servent</B> structure if the requested entry was
found, and a null pointer if the end of the database was reached or the
requested entry was not found.  Otherwise, a null pointer is returned.
</blockquote><h4>ERRORS</h4><blockquote>
No errors are defined.
</blockquote><h4>APPLICATION USAGE</h4><blockquote>
The <I>port</I> argument of
<i><a href="getservbyport.html">getservbyport()</a></i>
need not be compatible with the port values of all address families.
<p>
The
<i>getservent()</i>,
<i>getservbyname()</i>
and
<i><a href="getservbyport.html">getservbyport()</a></i>
functions may return pointers to static data, which may be overwritten by
subsequent calls to any of these functions.
<p>
These functions are generally used with the Internet address family.
<br>
</blockquote><h4>SEE ALSO</h4><blockquote>
<i><a href="endhostent.html">endhostent()</a></i>,
<i><a href="endprotoent.html">endprotoent()</a></i>,
<i><a href="htonl.html">htonl()</a></i>,
<i><a href="inet_addr.html">inet_addr()</a></i>,
<i><a href="netdb.h.html">&lt;netdb.h&gt;</a></i>.
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UNIX &reg; is a registered Trademark of The Open Group.<br>
Copyright &copy; 1997 The Open Group
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